Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6ee96ef9e99e121…

MALICIOUS

PDF

44.9 KB Created: 2020-08-23 11:28:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c7970e6643c84da5d7802f5e1e72ed8 SHA-1: 005a807c54468efd4ed4e315490ffde0a06b80e4 SHA-256: f6ee96ef9e99e1219a185368f639c5f233fd85faa7822c53981a97a6f860c6d7
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged as malicious by an ML classifier and contains a large number of embedded links, many pointing to external PDF files hosted on various domains. One critical heuristic identified a link to a known malicious redirector infrastructure. The document body contains text related to searching by image on Android, which may be a lure, and also includes the malicious redirector URL.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.cc/pify?keyword=can+i+search+by+image+on+android
    • http://files.globalcitymission.org/uploads/1/3/0/7/130776295/b9159f2.pdf
    • http://files.sister-love.com/uploads/1/3/1/4/131407135/5da7c.pdf
    • http://files.tynksgemstonedesigns.com/uploads/1/3/2/7/132740415/7381d2f1749d4.pdf
    • http://rakinozi.termaxe.com/uploads/1/3/0/8/130814471/5912644.pdf
    • http://baduvov.jacquelinecutler.com/uploads/1/3/0/8/130814229/76e426f43da.pdf
    • https://cdn.shopify.com/s/files/1/0438/0295/1842/files/biblia_de_estudio_reina_valera.pdf
    • https://cdn.shopify.com/s/files/1/0431/3851/5098/files/analyse_2_smia_exercices_corrigs.pdf
    • https://cdn.shopify.com/s/files/1/0436/4497/7305/files/xumexirorazoveba.pdf
    • https://cdn.shopify.com/s/files/1/0434/4712/4135/files/13437803861.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/demesudixagivok.pdf
    • https://cdn.shopify.com/s/files/1/0437/3889/0394/files/star_wars_jedi_academy_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0428/4016/2467/files/tulan.pdf
    • https://cdn.shopify.com/s/files/1/0437/7985/0398/files/maluxufor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7689/4372/files/bikini_body_guide_workouts.pdf
    • https://cdn.shopify.com/s/files/1/0436/4189/7110/files/business_plan_app_mobile.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/73737395223.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000063ed.bin
94c4abb508374d9e38f4eba206cc93ca965acd73d98d69526d8b344f4b00551d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63ED 5292 bytes
font_01_sfnt_off000075af.bin
b4a7502c0f7cb1fc2d561226807c91dfa90a932a3f2b7f3b9d4da0b1af381686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75AF 10236 bytes
font_02_sfnt_off000098b2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98B2 4324 bytes

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